for·tis·si·mo & adj. Abbr. ff pl. for·tis·si·mos forte , strong ; see forte 2 .]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Dictionary.com's 21st Century Lexicon
Copyright © 2003-2009 Dictionary.com, LLC
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Medical Dictionary
Main Entry:
FF Function:
abbreviation 1 fat free
2 filtration fraction
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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(fôr-tĭs'ə-mō') 
